Fun little game! However, from a game-design perspective, I'm not really sure about fake information (invisible blocks/fake floors), it leads to trial'n'error and head-bashing the characters head against everything until finding the solution, which can be frustrating ^^'. Don't hesitate to give the player a way to know what is real =).
Otherwise, the music is enjoyable, the graphics are nice and the general vibe of the game is good. Congratulations, and keep up the good work =)